Author: fca
Date: 21:02:15 08/09/98
Go up one level in this thread
On August 09, 1998 at 20:13:56, Christophe Theron wrote: >On August 09, 1998 at 19:18:52, Robert Hyatt wrote: > >>On August 09, 1998 at 10:22:31, Christophe Theron wrote: >> >>>Thorsten talked about this, but maybe it applied to older versions of Lang's >>>programs. Nobody has given evidence that Genius selects differently its moves >>>than the opponent's, except in the very end of the lines. >>> >>> >>> >> >> >>actually, several posted a few positions where Genius appeared to show an >>asymmetric search. It couldn't find the key move with a very deep search, >>yet if you play the key move and let it play the other side, it would find that >>it was lost very quickly. Which lends credibility to the idea that it looks >>at everything for the opponent, but prunes (forward prunes) its own moves >>quite a bit in the right circumstances... > > >I remember Thorsten said he would post some of these positions, but he didn't do >it, or I just missed his posts. > >I would be interested to see such positions. If somebody has found such >examples, would he be kind enough to repost them, please? I think there is a misunderstanding here. By Bob, maybe by Thorsten and others too. Genius is highly "modularised." Depending on perceived game phase, a different evaluation module (code segment - not just a couple of variables) is used. But... Which module to use is only set at root level. Within, the same module stays used. So say the root move being considered would, if made, change perceived game phase (not necessarily a capture, but usually so, I believe). While it is examined - even to 32 ply depth - the lens used will still be for module x. However deep the search. Now the move is chosen. So module y is now used. Alas, the evaluation is significantly changed - i.e. Genius now "sees it" truly. This is the heart of the problem that is misdiagnosed as asymmetry (without denying or confirming that such asymmetry exists :-) ). Kind regards fca
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